+ = 1- = 1.25× = - =
0.9+99×0.9= 0÷ = 1÷ = -0.5=
0.6×101= 3.2×2.5×12.5=
196﹣69=
× =
÷ =
6.22+44.78=
6÷2%=
3﹣3÷7=
+ =
+ ÷ =
598+403≈
0.125×3.2=
24÷ =
0.5×0.6÷0.5×0.6=
①( ﹣ )×24
②0.36×99+0.36
③20.8﹣(9.6+0.125÷12.5%)
④( ﹣ ÷2)×
⑤2.5×16×12.5
⑥0.5÷[ ﹣( ﹣ )]
÷(8.4-5.4) 13.62﹣2.84+6.38﹣7.16 32.9×140%-32.9×
涂色正方形个数
1
2
3
……
空白正方形个数
8
13
18
观察图形规律,当涂色正方形的个数是5时,空白正方形的个数是 ;若涂色正方形的个数是n,空白正方形的个数是 。
列式:
口诀:
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□○□ =□( )
□○□=□( )